CN102136828B - Cylinder wall type electromagnetic interference (EMI) filter consisting of spiral flat coil - Google Patents
Cylinder wall type electromagnetic interference (EMI) filter consisting of spiral flat coil Download PDFInfo
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- CN102136828B CN102136828B CN201010603599.XA CN201010603599A CN102136828B CN 102136828 B CN102136828 B CN 102136828B CN 201010603599 A CN201010603599 A CN 201010603599A CN 102136828 B CN102136828 B CN 102136828B
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- 239000003990 capacitor Substances 0.000 claims abstract description 31
- 229910010293 ceramic material Inorganic materials 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 4
- 238000004804 winding Methods 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 3
- 229910000859 α-Fe Inorganic materials 0.000 claims description 2
- WSNMPAVSZJSIMT-UHFFFAOYSA-N COc1c(C)c2COC(=O)c2c(O)c1CC(O)C1(C)CCC(=O)O1 Chemical compound COc1c(C)c2COC(=O)c2c(O)c1CC(O)C1(C)CCC(=O)O1 WSNMPAVSZJSIMT-UHFFFAOYSA-N 0.000 abstract description 3
- 230000003071 parasitic effect Effects 0.000 description 4
- 239000004020 conductor Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002650 habitual effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
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Abstract
The invention provides a cylinder wall type electromagnetic interference (EMI) filter consisting of a spiral flat coil. The filter comprises an EER magnetic core, and common mode integrated LC modules, a leakage inductance layer and differential mode capacitors which are arranged by taking the EER core as an axis. The common mode integrated LC modules comprises a common mode integrated LC structure I and a common mode integrated LC structure II. The differential mode capacitors comprise a differential mode capacitor I and a differential mode capacitor II. The two common mode integrated LC structures are isolated by the leakage inductance layer. The differential mode capacitor I is arranged at one end of the common mode integrated LC module as the input end of the whole filter, and the differential mode capacitor II is arranged at the other end of the common mode integrated LC module as the output end of the whole filter. The cylinder wall type integrated LC structures are adopted as basic components of the integrated EMI filter provided by the invention, so that high frequency current is uniformly distributed on the spiral flat coil without influencing the performance of the filter; and due to the selection of the EER core, the utilization rate and effective section area of the core are both increased.
Description
Technical field
The present invention relates to a kind of EMI power-supply filter, particularly relate to the barrel type electromagnetic interface filter that a kind of spirality flatwise coil forms.
Background technology
In various power electronic equipments, the switch of power device has caused great voltage or current impulse, thereby has caused serious electromagnetic interference (EMI).At present, the means that people solve power electronics electromagnetic interference problem in Practical Project mainly contain two kinds: the one, find out the electromagnetic interference source of Power Electronic Circuit, and by researching and developing new components and parts, design new circuit topology and reduce or eliminate electromagnetic interference; The 2nd, adopt electromagnetic interference (EMI) filter effectively to block the delivering path of Conducted Electromagnetic Interference (150 kHz～30MHz), this is also the method for solution electromagnetic interference general, the most the most frequently used in current engineering.Between such filter suitable access power supply and load, can not only prevent that the noise conduction that power electronic equipment produces from entering electrical network, also can prevent that the various high-frequency noises in electrical network are coupled into power electronic equipment by conduction simultaneously.
The habitual discrete component of realization of EMI power-supply filter, has caused a lot of problems thus.One, because discrete component exists parasitic parameter, the equivalent parallel electric capacity of inductor (Equivalent Parallel Capacitance-EPC) for example, the equivalent series inductance of capacitor (Equivalent Series Inductance-ESL), some analysis results have also clearly illustrated that the high frequency performance of EMI power-supply filter is mainly decided by parasitic parameter; Its two, the parasitic parameter causing due to the wiring of filter also will further weaken the high frequency performance of filter; Its three, the problems such as space that interconnect be connected between the consideration of the factors such as the type of the different components and parts of a discrete EMI power-supply filter, size, size and components and parts, all will cause the reduction of space availability ratio.Therefore, moulding, structure, design and the optimization for EMI power-supply filter is all the difficult problem that Electrical Engineer challenges all the time.
The proposition of planar integrated magnetic electromagnetic interface filter is undoubtedly the quantum leap that filter is manufactured, a kind of broad sense transmission line theory being proposed by the YingLin Zhao of Virginia Polytechnic Institute and State University, predicted theoretically preferably the high frequency characteristics of plane LC structure, Rengang Chen has designed the planar EMI filter (Fig. 1) that is applied to switch power supply system, this filter adopts plane EI type magnetic core, by differential mode capacitor (101), the integrated LC structure of common mode (102) and leakage inductance layer (103) form, utilize a circle or less than the plane LC structure of a circle as differential mode capacitor, adopt four end points connected modes, to reduce the stray inductance of connecting, adopt the plane LC structure of two multiturns to connect into low-pass filter structure, be connected in parallel as common mode choke, this kind of structure realized the Planar Integrated Magnetic Structure of EMI power-supply filter, reduced volume, greatly improved power density, and reduced the parasitic parameter of high frequency.Planar integration electromagnetic interface filter shown in Fig. 1, the planar spiral winding of employing rectangle.But this filter is defect also, one, electric current, directly corner's distribution is very inhomogeneous, has a strong impact on performance of filter; Its two, magnetic core utilance is too low, effectively magnetic core sectional area is too little, can not effectively produce enough large inductance; Its three, the pcb board that forms Planar integration LC structure adopts the ceramic material of high-k, ceramic material is more crisp, is difficult for installing.
Summary of the invention
technical problem:
The object of the invention is the barrel type electromagnetic interface filter that the defect existing for prior art provides a kind of spirality flatwise coil to form.
summary of the invention:
The present invention for achieving the above object, adopts following technical scheme:
The barrel type electromagnetic interface filter that a kind of spirality flatwise coil of the present invention forms, comprise EER type magnetic core, and take that EER type magnetic core is that axle center arranges the integrated LC module of common mode, leakage inductance layer and differential mode capacitor module, the integrated LC module of common mode comprises the integrated LC structure I of common mode and the integrated LC structure I of common mode I, differential mode capacitor comprises differential mode capacitor I and differential mode capacitor II, between two integrated LC structures of common mode, by leakage inductance layer, isolated, differential mode capacitor I is arranged at one end of the integrated LC module of common mode as the input of whole filter, differential mode capacitor II is arranged at the other end of the integrated LC module of common mode as the output of whole filter.
The integrated LC structure of described common mode consists of barrel type ceramic material, and ectonexine helical coil consists of the flat wound line of identical live width, pitch and the number of turn respectively, and ceramic barrel adopts the ceramic material NPO that dielectric constant is 70-150.
Described differential mode capacitor consists of double-sided PCB board, and upper and lower planar spiral winding is single turn, and upper and lower two-layer full symmetric, and the sheet material of pcb board adopts the ceramic material Y5V of high-k 10000-20000.
Described EER type magnetic core (201) adopts Ferrite Material, also wraps plate cover plate and the corresponding setting of EER type magnetic core (201).
beneficial effect:
The present invention compared with prior art, the impact that while having eliminated high frequency, corner's CURRENT DISTRIBUTION inequality of rectangular coil coil is brought, the at right angle setting of the integrated lc unit of common mode has effectively reduced the coupling of inductance and electric capacity especially, simultaneously, adopted EER type magnetic core, greatly improved magnetic core net sectional area and magnetic core utilance, thereby increased inductance value, cumulative volume and the quality of filter also reduce to some extent, and power density is improved.The present invention can be applicable in the Front End Converter of distributed power supply system, compares with the EMI power-supply filter that discrete component forms, and volume obviously reduces, and has improved the insertion loss of filter, has improved the high frequency performance of filter.The present invention adopts the integrated LC structure of barrel type as the basic composition unit of integrated EMI filter, high-frequency current is uniformly distributed on planar spiral winding, can not affect the performance of filter, select EER type magnetic core to improve the utilance of magnetic core, increased magnetic core net sectional area, and be easy to install.
Accompanying drawing explanation
Fig. 1 is the integrated EMI filter based on the integrated LC structure of rectangle plane.
Fig. 2 A is the integrated EMI filter based on the integrated LC structure of barrel type.
Fig. 2 B is the equivalent lumped-parameter circuit of barrel type integrated EMI filter.
Fig. 3 A is the integrated LC structure of barrel type.
Fig. 3 B is the equivalent lumped-parameter circuit of the integrated LC structure of barrel type.
Fig. 4 A is integrated differential mode capacitor.
Fig. 4 B is the equivalent lumped-parameter circuit of integrated differential mode capacitor.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is elaborated:
Example as shown in Figure 2 A, the integrated LC structure of barrel type provided by the invention comprises 201, two differential mode capacitors 202 of an EER type magnetic core and 206, two integrated LC structures 203 and 205, one leakage inductance layers 204 as integrated EMI filter.The A of differential mode capacitor I (Fig. 4 A)
1and B
1input as filter is drawn by wire, C
1connect the A point of integrated LC structure I (Fig. 3 A), D1 connects the A point of integrated LC structure II, and the A2 point of differential mode capacitor II connects the C point of integrated LC structure I, and the B2 point of differential mode capacitor II connects the C point of integrated LC structure II, the D point of integrated LC structure I and II is ground connection respectively, and B point is all unsettled.Leakage inductance layer between integrated LC structure I and II, the C of differential mode capacitor II
2and D
2output port (Fig. 2 B) as filter.
Fig. 3 B is the equivalent circuit diagram of Fig. 3 A, and the number of turn of coil is
n 1, conductor width is
w 1, barrel ceramic thickness is
d 1, Fig. 4 B is the equivalent circuit diagram of Fig. 4 A, and the number of turn is 1, and conductor width is
w 2, pcb board thickness is
d 2, effective magnetic circuit area of magnetic core is
a e, the length of magnetic path is
l e, magnetic permeability is
μ r.
The ectonexine of integrated EMI filter is symmetrical about leakage inductance layer, inside and outside two-layer coming to the same thing.Its common mode inductance size is:
Integrated LC structure layer capacitance is as common mode capacitance:
In formula,
l 1total length for integrated LC structure coil wire.
The integrated LC structure of single turn is as differential mode capacitor:
In formula,
l 2total length for the integrated LC structure coil of single turn.
Describe example of the present invention above in detail, but should be appreciated that embodiments of the present invention are not limited in this, this example is only for helping to understand the present invention.Various variation instance made for the present invention, all should be within the scope of the present invention.Scope of patent protection of the present invention should have appending claims to limit.
Claims (3)
1. the barrel type electromagnetic interface filter that a spirality flatwise coil forms, it is characterized in that comprising EER type magnetic core (201), and take that EER type magnetic core (201) is that axle center arranges the integrated LC module of common mode, leakage inductance layer (204) and differential mode capacitor module, the integrated LC module of common mode comprises the integrated LC structure I of common mode (203) and the integrated LC structure I of common mode I (205), differential mode capacitor comprises differential mode capacitor I (202) and differential mode capacitor II (206), between two integrated LC structures of common mode, by leakage inductance layer (204), isolated, differential mode capacitor I (202) is arranged at one end of the integrated LC module of common mode as the input of whole filter, differential mode capacitor II(206) be arranged at the other end of the integrated LC module of common mode as the output of whole filter,
The integrated LC structure I of described common mode (203) and the integrated LC structure I of common mode I (205) consist of barrel type ceramic material, ectonexine helical coil (301 and 303) consists of the flat wound line of identical live width, pitch and the number of turn respectively, and ceramic barrel (302) adopts the ceramic material NPO that dielectric constant is 70-150.
2. the barrel type electromagnetic interface filter that a kind of spirality flatwise coil according to claim 1 forms, it is characterized in that described differential mode capacitor consists of double-sided PCB board, upper and lower planar spiral winding (401 and 403) is single turn, and upper and lower two-layer full symmetric, the sheet material of pcb board (402) adopts the ceramic material Y5V of high-k 10000-20000.
3. the barrel type electromagnetic interface filter that a kind of spirality flatwise coil according to claim 1 forms, is characterized in that described EER type magnetic core (201) adopts Ferrite Material, also wraps plate cover plate and the corresponding setting of EER type magnetic core (201).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010603599.XA CN102136828B (en) | 2010-12-24 | 2010-12-24 | Cylinder wall type electromagnetic interference (EMI) filter consisting of spiral flat coil |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010603599.XA CN102136828B (en) | 2010-12-24 | 2010-12-24 | Cylinder wall type electromagnetic interference (EMI) filter consisting of spiral flat coil |
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| Publication Number | Publication Date |
|---|---|
| CN102136828A CN102136828A (en) | 2011-07-27 |
| CN102136828B true CN102136828B (en) | 2014-01-29 |
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| CN201010603599.XA Expired - Fee Related CN102136828B (en) | 2010-12-24 | 2010-12-24 | Cylinder wall type electromagnetic interference (EMI) filter consisting of spiral flat coil |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102647166A (en) * | 2012-04-18 | 2012-08-22 | 南京航空航天大学 | Inductance-capacitance module for forming plane EMI (Electric-Magnetic Interference) filter |
| CN103065765A (en) * | 2012-12-15 | 2013-04-24 | 华南理工大学 | Planer Electro Magnetic Interference (EMI) filter based on overlapped interleaved windings |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101707478A (en) * | 2009-11-24 | 2010-05-12 | 南京航空航天大学 | Eliminator for parasitic inductance of smoothing capacitor |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101707478A (en) * | 2009-11-24 | 2010-05-12 | 南京航空航天大学 | Eliminator for parasitic inductance of smoothing capacitor |
Non-Patent Citations (4)
| Title |
|---|
| 利用平面线圈消除电容器寄生电感的影响;崔永生等;《电工电能新技术》;20100131;第29卷(第1期);45-48 * |
| 寄生参数效应的共模扼流圈集中参数建模;王世山等;《电力电子技术》;20080731;第42卷(第7期);73-75 * |
| 崔永生等.利用平面线圈消除电容器寄生电感的影响.《电工电能新技术》.2010,第29卷(第1期),45-48. |
| 王世山等.寄生参数效应的共模扼流圈集中参数建模.《电力电子技术》.2008,第42卷(第7期),73-75. |
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| CN102136828A (en) | 2011-07-27 |
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